Preventing creeping in recording-wattmeters.



" Frank G.Vau Hen No. 678,075. Patented luly 9, |90l.

F. G. VAUGHEN. PREVENTING GBEEPING IN RECORDING WATTMETERS.

. (Application filed Mar. 1, 1901.

(No Model.)

Fig.1.

v I r Witnesses I Inventor.

In: "our: PEIZIS w. moro'ufna. wgsammn. u c.

UNITED STATES PATENT OFFICE.

FRANK G. VAUGHEN, OF SOHENEOTADY, NE\V YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, OF NEW YORK.

PREVENTING CREEPING "IN RECORDING-WATTMETERS.

SPECIFICATION formingpart of Letters Patent No. 678,075, dated July 9, 1901.

Application filed March 1; 1901. Serial No. 49,419. (No model.)

To aZZ whom it may concern:

Be it known that I, FRANK G. VAUGHEN, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Preventing Creeping in Recording- Wattmeters, (Case No. 2,110,) of which the following is a specification.

This invention relates to recording electrical instruments, particularly such as recording-wattmeters. In this type of instrument there is a motor-driven counter, one motor element being energized by a potential circuit across the consumers mains and the other byafield-cireuit in series with the consumers translating devices. In order to render these instruments accurate,itis common in the modern type to employ an auxiliary field-coil for the purpose of overcoming the starting-friction, thereby leaving the motor in a condition to operate the counter under light loads and reducing the percentage of inaccuracy; but it frequently happens that instruments of this kind are installed in places where the instrument is subjected to vibration ,and it is noticed that under such circumstances the retarding efiect of friction is reduced,causing the torque of the starting-coil to bemore than is required to overcome friction. Under these conditions the motor may be kept in slow action under no load, thereby operating the counter when it should not register. Various devices have been suggested and many tried to overcome this difficulty; but since the degree of vibration is not uniform in all locations of service and since in many places a provision of this kind is not required at all none of the arrangements heretofore proposed have been entirely satisfactory. I cure the difficulty by providing the motordamper by which its speed of movement is reduced with a detachable and adjustable iron armature placed on the damping-disk in operative relation to the damping-magnet. With such a device an inspector mayeasily correct the inaccuracy of any instrument showing a tendency to start at no load. The device may be easily applied by the inspector, being simply a small piece v of iron in the form of a clip which may be slipped over the edge of the damper=disk and adjusted until a proper working relation is since in such a case a stalling eifect when the iron comes in the neighborhood of the magnet-poles is exercised at all times and in all service conditions, which, as hereinbefore stated, is not a desirable condition.

My invention therefore'comprises a meterv motor having mounted in operative relation to its rotary element a detachable retarding device periodically called into action during the rotation of the motor, so as to provide a dead-point by which rotation is arrested when no load is on the circuit. It comprises also other more specific features'the novelty of which will be pointed out hereinafter and will be definitely indicated in the appended claims.

In theaccompanying drawings, which illustrate oneforin of the invention, Figure 1 represents diagrammatically the well known Thomson recording-wattmeter having my invention applied to the damping-disk. Fig. 2 is a plan view of the magnetic damper of such an instrument. Fig.3 is a detail view showing a group of clips to prevent creeping in accordance with my invention.

I have shown in the drawings the anticreeping device as mounted upon the damper-disk. This is, however, not absolutely essential, as my invention would equally include the mounting of a periodically-acting retarding device of any character adapted to act upon the movable element of the motor, the essential feature of my invention residing in the fact that my device is detachable from the motor and adjustable thereon, so as to render it applicable to a meter in situ at a point where correction is desired, thus admitting of the exercise of the experience and judgment of the inspector and permitting the application only to such instruments as require correction of this nature.

1 1 represent the fieldcoils of a meter-mo tor of a recording wattmeter in series relation to a group of translating devices 2, which represent a consumers plant. The counter or register has not been shown, as the construction of recording-wattmeters is well under When such an instrument is installed ina place where there is considerable vibration or jarring, the armature may take a slow movement under the influence of the potential coilseven when there is no loadon the consnmers circuit and no lamps or other t-ranslatingide.=- 1

damper liavingadetachable clip of magnetic vices are in operation,tl1usoperatingtheregis ter and giving a false indication'of'the amount of energy used by theconsumer.. This is commonly calledcreeping. I correct the tendency by providing a small clip-offlnag: n etic'material adapted to be slipped'over the edge of the damper-disk andadjusted in more or lesscloserelation to the damper-magnets;

Such a clip-is shownrin operative're'lation'im Figs: 1- and 2 at 6. It iscomposedsimplyofl a small piece of iron or steel and! may bea piece-of bent iron Wire adaptedtobe foreed 5 over the edge of the disk, the elasticity of the limbs clamping it firmly to the disk; The in spector mayadjust lb'Wlbll relation to=the perk man ent magnets until it arrests thecreep1* ingtendencyof the meter-motor; Beingtlius" detachable and adjustable in its nature iti may be carried by the inspector in-his'pocliet andiappliedto an y instrumen t that needs'corerection.

I-am aware that it-lias-been:proposedto-prm videon the damper of a meter-motor apiece of ironto periodially checle creeping by tl1edetaining action on said non of the permanent' magnets. Such' devices havealW-ays;

vhowever, so far as I know, been a permanent part of the motor structure, thus applying to the entire product of a factory a correction needed only under particular conditions and When not needed introducing into the meter .an element which interferes with its absolute faccuracy; As my device, however, is applied only to such instruments as need it, it is free from such an objection. WVhatI claim as new, and desire to secure by Letters Patent of the United States, is

1. A meter-motor provided with a removable retarding device for periodically arrest- Ping the creeping of the motor.

i 2 Amet'er-motor provided with an adjustable and detachable magnetic retarding de- ;vice to compensatefor creeping 3. Aimeter-"m'otorprovided with a'mag netic material: iu-operativerelation to the dampermagnets.

4 AIIlGlIGP-HJOEOPPIOVldGLlWltll a magnetic dafmple'r'liavinga detachable and adjustable clip of magnetic" material in operative relation to the damper magnets.

5:. A meter-motorprovidedwith=a damper idislerevolving ina magnetic field and pro- 'videdw'itha removable piece of iron adjustable-with relation to the field.

6h A detachable retarding device for the gdampendisls of a meter-motor, comprising a golip of magnetic material adapted to be secured -tmthe" edgeof thedis-le.

idisk' otameter-motor; comprising apiece'of magnetic material' adapted tobe'secu red to the:- edgeot the disk atdiiferent distances ifromi-i'ts'center.

: Inwitness Whereof I-have hereunto set-my ihandlthis 27thday of February; 1901.

; FR- ANK G; VAUGIIEN.

1 Vi tnessesw BENJAMIN" B; HULL,

EDWARD \VILLIAMS', J r.

7i i i-detachablespring-ell p for the dam per 

